Editing Maximian (section)

===Joint campaign against the Alamanni===
Early the next year, as Maximian made preparations for dealing with Carausius, Diocletian returned from the East. The emperors met that year, but neither date nor place is known with certainty. They probably agreed on a joint campaign against the Alamanni and a naval expedition against Carausius.{{sfnm|1a1=Barnes|1y=1981|1p=7|2a1=Barnes|2y=1982|2p=57|3a1=Southern|3y=2001|3pp=142–43|4a1=Williams|4y=1997|4p=50}}

Later in the year, Maximian led a surprise invasion of the [[Agri Decumates]] – a region between the upper Rhine and upper Danube deep within Alamanni territory – while Diocletian invaded Germany via [[Raetia]]. Both emperors burned crops and food supplies as they went, destroying the Germans' means of sustenance.{{sfnm|1a1=Southern|1y=2001|1pp=142–43|2a1=Williams|2y=1997|2p=50}} They added large swathes of territory to the Empire and allowed Maximian's build-up to proceed without further disturbance.{{sfnm|1a1=Barnes|1y=1981|1p=7|2a1=Corcoran|2y=2006|2p=40|3a1=Southern|3y=2001|3p=143|4a1=Williams|4y=1997|4p=50}} In the aftermath of the war, towns along the Rhine were rebuilt, bridgeheads created on the eastern banks at such places as Mainz and Cologne, and a military frontier was established, comprising forts, roads, and fortified towns. A military highway through Tornacum ([[Tournai]], [[Belgium]]), Bavacum ([[Bavay]], France), Atuatuca Tungrorum ([[Tongeren]], Belgium), Mosae Trajectum ([[Maastricht]], Netherlands), and Cologne connected points along the frontier.{{sfn|Williams|1997|pp=50–51}}